Changes between Version 30 and Version 31 of DevWikiEmptyGeometry

Timestamp:

Nov 29, 2010, 5:48:16 AM (13 years ago)

Author:

wiki

Comment:

—

DevWikiEmptyGeometry

@@ -8 +8 @@
  * ST_Union(empty, empty) == empty
  * ST_Intersection(geometry, empty) == geometry
+   *   fabian thinks this should be empty
+     * In set theory, A ∩ ∅ = ∅ 
  * ST_Intersection(empty, empty) == empty
  * ST_Difference(geometry, empty) == geometry
@@ -18 +20 @@
      * NULL (by the SQL standard)
  * ST_Contains(geometry, empty) == FALSE (SQL Server says False)
+   *   fabian thinks this should be TRUE
+     * In set theory, every set contains ∅ 
  * ST_Within(geometry, empty) == FALSE (SQL Server says False)
  * ST_Contains(empty, geometry) == FALSE (SQL Server says False)